Bosch DSC 3.X User Manual download pdf (Page 11)

Wheel Speed Sensors

The wheel speed sensors used are the same as on previous E38 and E39 models. The

sensor is a hall effect type which sends a digital square wave to the DSC control unit.

Unique to this sensor is the two wire versus three wire configuration as on most hall effect

circuits.

The two wire hall effect wheel speed sensors receive a stabilized 8 volt power supply from

the control module through one wire. The ground path for the sensor is through the sec-

ond wire back to the control module.

The signal is generated by a pulse wheel affecting the voltage flow through the hall element

in the sensor. The pulse wheel is integrated into the wheel bearing assembly, behind the

seal. This protects the trigger wheel from foreign substances which may affect the wheel

speed signal.

This creates a square wave signal with a low of .75 volts and a high of 2.5 volts.

Introduction to DSC

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Bosch DSC 3.X User Manual Page 11